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National Rivers Authority - Anglian Region Regional Flood Defence Committee Technical Visit to Bremen 22 - 24 May 1995 I Natl rs Authority II fiO .,.; rre No .. l ^ ^ t o n No ..A .R .n ^ l Acknowledgments The Anglian Regional Flood Defence Committee acknowledges and thanks Dr Hans Kunz and colleagues for the hospitality, friendship and technical excellence of the visit to Upper Saxony in May 1995. Contents Page Number 1. Attendees 1 2. Itinerary 2 - 3 3. Introduction and report 4 - 11 4. Contacts in Germany 12 - 13 5. Photographs 14 6. Maps 15 7. Support Documents 16 ATTENDEES Mr J S Martin RFDC Chairman Mr J M Childs Chairman - Great Ouse Local Flood Defence Committee Sir E Greenwood Vice Chairman - Norfolk & Suffolk Local Flood Defence Committee Mr D J Riddington Chairman - Welland & Nene Local Flood Defence Committee Ms F J Madgwick Member of Regional Flood Defence Committee - Broads Authority Mr W H R Squier Chairman - Essex Local Flood Defence Committee Mr C J Groome Chairman - Regional Rivers Advisory Committee and a member of the Regional Flood Defence Committee Mr R Payne Member of Great Ouse Local Flood Defence Committee and of Bedfordshire County Council Mrs B M Goble Member of Great Ouse Local Flood Defence Committee and of Hertfordshire County Council Mr D J Fisher Vice Chairman - Essex Local Flood Defence Committee Mr T E Dale Member of Essex Local Flood Defence Committee and of Essex County Council Mr R J Epton Chairman - Lincolnshire Local Flood Defence Committee Mr R Runcie Regional Flood Defence Manager Mr A Baxendale Area Flood Defence Manager (Northern) Mr I W Hart Area Flood Defence Manager (Central) Mr J Hesp Area Flood Defence Manager (Eastern) Mr M Child Regional Manager Special Projects 1 REGIONAL FLOOD DEFENCE COMMITTEE TECHNICAL VISIT TO BREMEN 22/24 MAY 1995 ITINERARY Monday 22 May: 5.00pm (BST) Leave Stanstead 7.30pm (local time) Arrive Bremen Transfer to Ubersee Hotel, informal dinner followed by sightseeing walk around centre of Bremen (time permitting). Tuesday 23 May: 8.45am/9.00am Depart from hotel by bus to Department of flood protection/Sena fur Umweltschutz und Stadtentwischlung, Hansestadt, Bremen. 9.00am - 10.30am The flood protection of the Bremen area; demonstration of the storm flood forecast system (Head of the Department and his staff). 10.30am - 12.00pm By bus from Bremen to Elsfleth (Hunte Gate) with some stops for explanations. 12.00pm - 1.30pm Technical visit of the Hunte Gate (Storm Surge Barrier) and lunch. Presentations on the flood protection of the Lower Weser Estuary and its tributaries (especially Hunte with Oldenburg town) by the STAWA, Brake - Head and his staff. 1.30pm - 2.30pm From Elsfleth to Brake with stops in Brake village (flood protection constructions). 2.30pm - 4.30pm Lectures, tea and cake in the STAWA, Brake (Head and staf f^- Orgamsation of the flood protection in Lower Saxony/Germany. Protection of the low lying marshes along the North Sea against water (storm flood, fresh water runn off)- Dike and Water Boards. 4.30pm - 6.00pm From Brake to Varel with stops on the Jade Bay (natural resort, pumping station, tide gate). 2 6.00pm - 7.30pm Hotel Friesenhof in Varel, relaxing or casual walk around town. 7.30pm onwards Informal dinner with representatives of STAWA Brake, Dike Board and Contractors; with lectures and discussions concerning development of the coastal protection for Germany and actual problems, such as integrated concepts, managed retreat etc. (Lead by our host, Dr Hans Kunz, Director of the Lower Saxonian Central Board for Ecology). Wednesday 24 May 9.00am - 10.30am Reinforcement of the sea dike in Groden/Jade Bay:- Technical solution Problems concerning clay and sand reclamation for the construction 10.30am - 12.00pm Dangast, Petershorne, Wilhelmshaven (by bus with stops), for the "Sudstrand”, part of Wilhelsmhaven town. 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In particular, strong links had been established with Dr Hans Kunz of the German Coastal Research Station based at Nordeney in Germany. Dr Kunz in liaison with Robert Runcie, Regional Flood Defence Manager, extended an offer to organise a visit of representatives from the Anglian Region Flood Defence Committee to Germany to see coastal protection works, to explore the ways in which our countries deal with common coastal protection problems and build technical links. The visiting party was led by John Martin, the Regional Flood Defence Committee Chairman, and included the Chairman and/or representatives from each of the Local Flood Defence Committees as well as the Regional and Area Flood Defence Managers. The visit began on the evening of the 22 of May 1995 and a full itinerary of visits and discussions took place over the next two days. The presenters included a number of those responsible for land drainage, flood defence and environmental protection in the areas visited. t BACKGROUND TO THE AREA The general area visited was around Bremen in the state of Lower Saxony in Northern Germany. The area has much in common with East Anglia having a coastline which includes both areas subject to wave attack and protected areas at risk from high tide levels, behind which He extensive low lying agricultural areas and navigable tidal rivers extending some distance inland to urban and industrial centres. Lower Saxony has a coastal area of around 8000 km2 and flood defence works including 1100 km of sea, channel and river embankments, 12 storm surge barriers and extensive defence works in the form of embankments as well as beach and dune protection works on the offshore east Friesian Islands. 4 The planning and development of flood defence works on the mainland is undertaken by Regional Agencies for Water and Waste Management, with Regional Government being responsible for considering feasibility and economic factors in conjunction with the Lower Saxony Minister for the Environment. At local level Dike Associations are responsible for the maintenance of the dikes and works to replace them where necessary. The Dike Acts which prescribe the duties and responsibilities of the various organisations were established principally following major flooding in the state in 1962 and these Acts prescribe the design standard of the defences which must be maintained. This has a profound effect on the promotion of flood defence works when compared with the situation in England and Wales. 5 DAY 1 - 23 MAY 1995 FLOOD CONTROL AND WARNING - BREMEN AREA The first visit was to meet staff of the local authority for environmental protection and town development in Bremen (which has State status). Hugo Wohlleben our presenter is responsible for flood warning and protection for the area around Bremen and Bremenhaven, and he outlined to the group the general warning and. protection systems in place and demonstrated some of the systems used for monitoring and forecasting storm surges. The area has some 170/km of flood embankments along the River Weser and its tributaries (the Lesum, Ochtum and Geeste). Following flooding in Holland in 1953 and in Lower Saxony in 1963 the tidal embankments were improved to design standards up to 1:1000 and 3 tidal barriers were constructed.